The phrase "put griddle" means to place a griddle on a heat source, typically a stove or grill, in order to cook food. Some synonyms for this phrase could include "heat up griddle," "set griddle," "place griddle," or "position griddle." Other related phrases could include "prepare griddle," "preheat griddle," or "get griddle ready." These synonyms all convey the same basic action of preparing a griddle for cooking, but may be useful in different contexts or for different types of cooking methods. Overall, there are many ways to express the idea of putting a griddle on a heat source, depending on the specific situation and desired outcome.